Joy, all I can think to say is what a good life you and Alex, Ryan and Robbie, gave McKenzie.  You nurtured her and let her pursue her interests.  You provided so much love and she gave it in return.  So full of life for a soul that suffered with CF.  I am so happy that she had six great years that were free of hospitalizations and was heartbroken when I read your post.  God love you all.